Provides information for parents of infants and toddlers. The meaning of INFANT is a child in the first period of life. How to use infant in a sentence. Discover the distinct stages from newborns to toddlers with clear age ranges and developmental milestones. Support your child's growth with this helpful guide. From baby bottles and bedding to development and sleep, WebMD's Baby Center helps parents know what newborns need during the first year. Infant development begins at birth. Consider major infant development milestones from birth to 3 months — and know what to do when something's not right. As an infant's diet matures, finger foods may be introduced as well as fruit, vegetables and small amounts of meat. [13] As infants grow, food supplements can be added. Many parents choose commercial, ready-made baby foods to supplement breast milk or formula for the child, while others adapt their usual meals for the dietary needs of their child. INFANT definition: 1. a baby or a very young child: 2. a student at an infant school: 3. → infant school. Learn more. National Institute of Child Health and Human Development (NICHD) Visit to learn how to reduce the risk of Sudden Infant Death Syndrome (SIDS) and safe sleep environments. World Health Organization Information on Infant Nutrition has information to promote proper feeding for infants and young children. Newborn vs Infant: Learn the exact age ranges (0-28 days vs 1-12 months), feeding needs, sleep patterns, and developmental milestones. postmature infant (postterm infant) one born any time after the beginning of the forty-second week (288 days) of gestation. small-for-gestational-age infant a preterm, term, or postterm infant who is below the 10th percentile for gestational age in head circumference, body weight, or length.